function db_query($sql) {
 // Declare as static variable before declare global
 static $total_mysql_queries;
 // Declare as global variable
 global $total_mysql_queries;
 
 if(mysql_query($sql)) { // Query successfully executed?
 
  // Add +1 to variable $total_mysql_queries
  ++$total_mysql_queries;
 
  // Return true, the query was successfully executed
  return true; 
 
 }
// I'm sure there was a mysql error...
return false;
}
Include the db_query() function into your code, replacing all instances of mysql_query and perform your MySQL queries.

db_query('SELECT `user` FROM `users` WHERE `id` = 1 ORDER BY `id` LIMIT 1;') or die(mysql_error()); 
 
db_query('SELECT `user` FROM `users` WHERE `id` = 2 ORDER BY `id` LIMIT 1;') or die(mysql_error()); 
 
db_query('SELECT `user` FROM `users` WHERE `id` = 3 ORDER BY `id` LIMIT 1;') or die(mysql_error());
Than, at the end of your code, add:

echo 'A total of ', isset($total_mysql_queries) ? $total_mysql_queries : 0, ' MySQL queries were executed.';